<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Hi Xavi,<div class=""><br class=""><blockquote type="cite" class="">Am 11.11.2017 um 13:12 schrieb Xavi Drudis Ferran <<a href="mailto:xdrudis@tinet.cat" class="">xdrudis@tinet.cat</a>>:<br class=""><br class="">El Thu, Nov 02, 2017 at 06:17:11PM +0100, H. Nikolaus Schaller deia:<br class=""><blockquote type="cite" class="">So I'd be interested in which products (or services) you as<br class="">a member of the tinkerphones community would like to see. So<br class=""></blockquote><br class="">A battery charger ?<br class=""><br class="">Maybe it's just me, but I keep getting too little time out of my GTA04<br class="">battery. I carry a few battery spares and that's enough, but then I<br class="">have to charge several of them, and I only have the GTA04 to do it. I<br class="">charge the one in the phone, when it's full, swith it off, change<br class="">battery, charge that one, and again. It takes a while for each and<br class="">often I forget I have to change the batery and when I need them they<br class="">are not charged. I'd like to have a charger where I can put 2 or 3<br class="">batteries and forget about them until later to just pick them up<br class="">charged.<br class=""><br class="">I guess it's low tech and boring, but it'd be useful and I'd like to<br class="">buy it. I'm not sure if someone else would like it. <br class=""></blockquote><div class=""><br class=""></div>I would like it as well!</div><div class=""><br class=""></div><div class="">And I have a simple idea how to build one. I still use one of the original</div><div class="">GTA04A1 prototype boards where just some components were soldered on,</div><div class="">incl. the battery connector. I use it to power a GTA04 from battery</div><div class="">without covering the OMAP processor. It is not a charger (there is</div><div class="">no charger chip installed), but used as a power bank...</div><div class=""><br class=""></div><div class="">It looks like this (the board on the left is the GTA04A1):</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><img apple-inline="yes" id="5E6D1819-4E10-4DFB-92D9-E72713C77980" height="280" width="640" apple-width="yes" apple-height="yes" src="cid:A72FEDA7-E385-45DE-B09F-043F527FB1BD@Speedport_W_700V" class=""></div><div class=""><br class=""></div><div class="">Now, the idea is to provide a PCB very similar to this, but have:</div><div class="">* the correct spring loaded battery connector</div><div class="">* some metal handles (cut&bent a copper staple and solder to the board) to keep the battery in place</div><div class="">* an Mini-USB socket so that you can connect to a standard wall charger or a PC or hub</div>* it should even be possible to strap together with the GTA04 Qi-Charger:)<br class=""><div class="">* a LiIon charger chip that can run a charging cycle w/o any CPU support</div><div class="">* some LED(s) to show the charging status</div><div class="">* is likely ~20€ per unit</div><div class=""><br class=""></div><div class="">I think you can then just take two or three of those and connect to some</div><div class="">(old) externally powered hub to charge several batteries in parallel.</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Would this fit your needs? Would others be interested as well? Additional ideas?</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Generally, this discussion has already turned out to be very fruitful!</div><div class=""><br class=""></div><div class="">We already have identified as not difficult to provide:</div><div class="">* Qi-charger kit for GTA04 (working prototype already presented a while ago: <a href="https://twitter.com/goldelico/status/815234456126689280" class="">https://twitter.com/goldelico/status/815234456126689280</a> )</div><div class="">* FST-01 crypto-key clone (Big-USB or Mini-USB plug for GTA04)</div><div class="">* standalone GTA0x battery charger for HF08 batteries</div><div class=""><br class=""></div><div class="">More ideas are welcome! Make GTA0x great again :-P</div><div class=""><br class=""></div><div class="">BR,</div><div class="">Nikolaus</div><div class=""><br class=""></div><div class=""><br class=""></div></body></html>